Fire extinguisher



FIG. 1 is a perspective view of a front, top, and left side of anornamental design for a fire extinguisher;

FIG. 2 is a front elevational view of the fire extinguisher of FIG. 1;

FIG. 3 is a rear elevational view of the fire extinguisher of FIG. 1;

FIG. 4 is a left side elevational view of the fire extinguisher of FIG.1;

FIG. 5 is a right side elevational view of the fire extinguisher of FIG.1;

FIG. 6 is a top plan view of the of the fire extinguisher of FIG. 1;and,

FIG. 7 is a bottom plan view of the fire extinguisher of FIG. 1.

CLAIM The ornamental design for a fire extinguisher, as shown.